Billet aluminum 45 degree PWC water bypass. For 1/2 inch id waterline and 3/4 inch hole thru the hull. Anodized for protection against corrosion. Can be used to replace the stock water bypass or to add additional bypasses for added cooling. Fits many pwc such as Sea Doo, Kawasaki, Yamaha, Polaris, and Honda. Also fits the Yamaha AR series boats with the TR-1 and 1.8L engines.